Grease gun



Marh'ch 12, 1929. l.. DELMANN GREASE GUN original E led July 17, 1925 Patented Mar. l2, l.

,tu sa trl Lne nnnnirnniv, or cnreneo, inni-noie, sesiones To n. ,nnnniunn'na corirfnivyr CECAGO, IILLNOIS, A CORPORATION OF ILLINOIS.

GREASE GUN.

Original application led' July 17,1325, Serial No. 44,308. Divided and this application. iledA July 16,

1 i '1927. Serial No..206,343. r'

\ This invention relates to grease guns and particularly to high pressure grease guns, as set tort-h in myco-pending application, Serial No. 44,808, of which this is a division and continuation.

fin object ci my inventionis to provide a grease gun structure of such torni that it can be readily applied to supply lubricant. to

Tease cups or other littings which ywould otherwise be diiicult to reach.

Aiurther object resides in so constructing and assembling' the parts that the gun will give and will stand arfhigh pressure upon the grease or material being' extruded without leaking.' l Y; c Another object is to provide' a grease gun in which the feed of lubricantis accomplished i by a plunger andipressure screw, and to sov construct these parts that the return oithe plunger can befaccoinplished quickly and wit-h :facility following a .pressure grease feeding stroke, and that the plunger can be fitted and ted into the `barrel of the 4gun without difficulty.

Niththe above and other objects in view which will be apparent to those skilled in the art, my present invention includes certain novel teaturesot construction and combination ot parts which will be hereinafter set iort'h in connection with the drawing in the drawing:l y Fwure 1 is avview in side elevation of a gun constructed in accordance with my invention.

Fig. 2 is a longitudinal sectional vliew through the grease gun structure.

ine Luoulai ai rel 1 is screw-t nearer a 2 and 8 ,at its ends, and a cap l is iitted on one end and is provided with an outwardly extending externally screw-threaded sleeve 5. A pressure nut 6 is internally threaded to be turned upon the threaded sleeve 5, and is provided with a reduced internally threaded bore Z beyond the sleeve, and a pressure screw 8 is turned into this threaded bore.

T he pressure screw 8 has a handle 9 at its outer end and its inner end carries a plunger 10, which plunger is provided with a cup washer 11 of leather or other suitable material. r1`his plunger 10 is preferably swivelled on the end of thepressure screw 8, and

the. pressure screw is ot a diameter to turn.

freely within the openingot the sleeve v5.

A cap 12 is provided to b'eyturned onto the threaded end 8.0i the barrel l.Land has a central'bore 18 -formed therethrough sub- 4 in extension nozzle 16 has a lballjoint'l? on one end adapted -toit within ,the Eball socket 15,'and apacking,` ring- 18 is'provided betweenthe ball and socket.` A curved ring..

washer 19 isprovidedto fit within the bore 18 against the inner-*side ot the ball portion' 1'?, 'and is open in its center todleav'e a freeA opening to the p assageQOthrough the ball 17j and the extension noZle 16. y y

A ringqv washer 211isprovided .to be litted within the cap 12 and is presseddown bythe russe end or' the barrel ltoengage with a 'shoulder 22 formed around thevbore 13. .A coil spring Q8 is mounted between thiswasher'Ql and the bearing washer 19, and this s pring exerts pressure upon the washer 19- to hold the ball port-ion 17in a proper tit against the packing washer 18 in the socketbearing With this arrangementot theparts the bearing; ball 1f? has a grease tight lit'within the socket atall time/aand the pressure of grease' extruded through the passage 20, upon the innerside of the ball 17,-will aid inmaintaining this tight fit. i

rllo insure an `uiiob'stru@ted flow of grease throuogh the iassac'c 2O it is ureterable that c l a n l the end 'ot the passage 20 where itvopensy rthi-mieli the ball portion 17 be reamed or otherwise enlarged as at 24.

Any torni t )e ot coualino' which is l. t E37 VindicatedvatwZi can be used tovconn'ect the nozzle 18 with grease cups, greaseittings. and other parts to'have lubricant suppliedv thereto.V y A vWith the swivel or universal mounting of the nozzle 16, it will be'found desirable to l load the barrel ot my improved grease gun through lthe outer threaded end at 2, and this A'requires withdrawal of the pressure screw 8 and plunger 10. 1n grease guns asnow constructed diiiiculty is eirperienced in retittinp;

the plunger into the barrel after withdrawal of the same, as the cup washer'llexpands as soon asl withdrawn and this cannot be readily replaced within the outer end'of the barrel.

rlp'o'overcoine this ditliculty make the cap l y of greater length than is required to embrace the screw threaded portion 2 and reduce the Y inner bore of the cap to be of substantially the same diameter as the inner diameter `of the barrel. ith this construction the'plunger l can be drawn back into the cap to such an extent that the cup washer 1l is entirely within this reduced bore at 26, and in re-assem bling the parts the cap is turned onto the threadedend 2 and the `plunger can then be :ted forward into the barrel through the medium of the pressure screw 8 without danger ot `the cup washer being displacedy or damaged. Also,with this construction itis possible to fill the ba 1Vrel l with grease entirely up to its end and. the gun can be assembled with' out the possibilityy of any et the grease being squeezed outaround the barrel by the plunger l0, as the parts are assembled.

By passing the pressure screw s 8 loosely through sleeve and providing the pressure nut 6, it is possible to remove the pressure nut and spin the same upon the pressure :screw 'to feed the screw back when the gun is to be' reloaded, and thus the tedious operation of turne ing the screw toaceomplish this feed bacjl is avoided.

lhile I have herein 'shown and described i only certain specific embodiments of this in- 1 vention, it 'will be appreciated that changes tion itted within said socket for universal movement, anda retaining Washer fitted within the cap and held in place by the barrel to retain said bearingvportion within the socket, Y

2, A grease gun comprising a barrel open at one end, a cap to be removably tted to Vclose said open end provided with acentrai passage and having a socket bearing therein, a grease nozzle provided with a bearing portion at one end to iit within the socket for universal movement, a washer iitted- .within the Cap and held in place by connection of the barrel therewith, and a spring conned by sa-id washer to hold the bearing portion withinthe socket.k Y

8. A grease gun comprising a barrel open at oneend, a cap to be removablyv fitted to close said open end provided with a central passage and having a socket bearing therein, a grease nozzle provided with ya bearing ball at one end vto fit within the socket, a washer fitted within` the passage of the ,cap to bear upon the inner side ,ofthe ball, a second washer iitted within the cap `and :secured in place by contact `with the end oit the barrel, and a spring conned between said washers.

A. A grease gun comprising a barrel open at one end and externally screw threaded., a

cap threaded to tit upon the barrel providedV with a sleeve portion open at its end and `having a soeket bearing adjacent said open end,`a grease nozzle provided with a bearing ball at one end to lit within the socket, -a packing gasket .between said bearing ball ,and sai-d socket, a curved washer fitted within the sleeve in contactvwith thefbearing Vtball, a washer fitted within the cap and of suiiioient diameter to'heengaged and held in place by thexend .ofi the barrel when screwed intothe cap, and a coil spring fitted between said washer and the .curved Washer.

In .testimony whereof I hereunto affix-my signature. f

LEO EDELMANN. 

